Why is it important to have an antibiotic resistance gene in the cloning plasmid?
a. It makes the bacteria resistant to the antibiotic.
b. It provides a way for researchers to sort the bacteria that have the cloning plasmid from
the bacteria that don't have the cloning plasmid.
c. It aids scientists in developing new antibiotic treatments.
d. It provides a way for sorting bacteria that have the gene of interest from the bacteria that
just have an "empty" cloning plasmid.
e. It makes the bacteria produce more clones.
B
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Human stem cells are valuable in drug development because they can be used to
A) create experimental organisms, such as rats and mice. B) replace experimental animals such as rats and mice. C) grow human embryos in culture, on which drugs can be tested. D) study the latest stages of the disease that would have unfolded if the person hadn't died.
A calcareous structure associated with sensory receptors are: a. Ampullae of Lorenzini
b. otoliths. c. neuromasts. d. maculae.
Four of the five choices listed below are functions of
the skeleton. Select the exception. a. control of body temperature b. production of blood cells c. protection d. calcium and phosphorus storage e. muscle attachment
What mammals retain their young for a long period of development within the mother's uterus?
A. placentals B. marsupials C. monotremes D. no mammals retain their young within the female